A post shared by Michael Phelps (@m_phelps00) on May 7, 2016 at 10:22am PDT

The Olympic swimmer posted a precious picture on social media with the caption: “Welcome Boomer Robert Phelps into the world!!! Born 5-5-2016 at 7:21 pm !!! Healthy and happy!!! Best feeling I have ever felt in my life!!!”

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Boomer was born in Arizona as his dad has been training at the Olympic Training Center in Colorado.

What do you think about the baby's name? Tweet us @OKMagazine or let us know in the comments section!

What a great Mother’s Day gift! Michael Phelps and his fiancée, Nicole Johnson, announced the arrival of their son, Boomer Robert, on May 5!

The Olympic swimmer posted a precious picture on social media with the caption: “Welcome Boomer Robert Phelps into the world!!! Born 5-5-2016 at 7:21 pm !!! Healthy and happy!!! Best feeling I have ever felt in my life!!!”

Boomer was born in Arizona as his dad has been training at the Olympic Training Center in Colorado.

Last month at a swim meet, the gold meal winner admitted he’s going to be a “very protective” parent. “That's how I am.”

Michael and Nicole have been engaged since February 2014 and plan to get married once the 2016 Rio games are over!

What do you think about the baby's name? Tweet us @OKMagazine or let us know in the comments section!